ci: fix perf test working directory

Author: triceo

.github/workflows/performance_score_director.yml

@@ -172,7 +172,7 @@ jobs:
         uses: actions/download-artifact@v4
         with:
           name: binaries-${{ matrix.example }}
-          path: ./timefold-solver-benchmarks/
+          path: ./timefold-solver-benchmarks
 
       # Fine-tuned for stability on GHA.
       - name: Configure the benchmark
@@ -195,6 +195,7 @@ jobs:
           RUN_ID: ${{ env.SANITIZED_BASELINE }}
         shell: bash
         run: |
+          mkdir target
           cp benchmarks-baseline.jar target/benchmarks.jar
           ./run-scoredirector.sh
           echo "RANGE_START=$(jq '.[0].primaryMetric.scoreConfidence[0]|round' results/scoredirector/${{ env.RUN_ID }}/results.json)" >> "$GITHUB_OUTPUT"